Element | ERL-ERM range | This study range | Percentage of sampling sites | ||
---|---|---|---|---|---|
< ERL-ERM range | Between ERL-ERM range | > ERL-ERM range | |||
Dry season | |||||
 Cd | 1.2–9.6 | 2.1–2.9 | – | 100 | – |
 Cr | 81–370 | 16.2–43.7 | 100 | – | – |
 Cu | 34–270 | 1.6–15.3 | 100 | – | – |
 Pb | 46.7–218 | 124.4–256.4 | – | 91 | 9 |
 Ni | 20.9–51.6 | 15.6–36.2 | 36 | 64 | – |
 Zn | 150–410 | 4.0–110.0 | 100 | – | – |
Rainy season | |||||
 Cd | 1.2–9.6 | 2.5–3.1 | – | 100 | – |
 Cr | 81–370 | 18.3–29.4 | 100 | – | – |
 Cu | 34–270 | 2.1–6.2 | 100 | – | – |
 Pb | 46.7–218 | 101.4–133.7 | – | 100 | – |
 Ni | 20.9–51.6 | 14.6–24.0 | 55 | 45 | – |
 Zn | 150–410 | 4.8–38.2 | 100 | – | – |